using System;
using System.Collections.Generic;
using System.Linq;
using System.IO;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Foundations
{
    public static class Preamble
    {
        private static bool SetupBlacklight(string preferredBlacklightModule)
        {
            Blacklight.Core.GraphicsAdapterManager.Singleton.ForceStartup();

            try
            {
                Blacklight.Core.GraphicsAdapterManager.Singleton.SetCurrentModule(preferredBlacklightModule);
            }
            catch (Exception)
            {
                System.Windows.Forms.MessageBox.Show(String.Format(
                    "Could not create preferred Blacklight module {0}.  Will now exit.", preferredBlacklightModule),
                    "Critical Error");
                return false;
            }

            return true;
        }

        public static string CalculateUserDataDirectory(string projectName)
        {
            return Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments), projectName);
        }

        private static void MaybeCreateUserDataDirectory(string projectName)
        {
            string userDataDirectory = CalculateUserDataDirectory(projectName);
            if (!Directory.Exists(userDataDirectory))
            {
                Directory.CreateDirectory(userDataDirectory);
            }
        }

        /// <summary>
        /// Does initial startup tasks such as checking on the .NET version and initializing Blacklight.  This should
        /// be called before anything else in the program.
        /// </summary>
        public static int InitialStartup(string projectName, string preferredBlacklightModule)
        {
            if (!DotNetVersionCheck.CheckDotNetVersion())
            {
                return 1;
            }

            if (!SetupBlacklight(preferredBlacklightModule))
            {
                return 2;
            }

            MaybeCreateUserDataDirectory(projectName);
            return 0;
        }
    }
}